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  • Summit White 2020 GMC Sierra 3500 SLTSummit White 2020 GMC Sierra 3500 SLTSummit White 2020 GMC Sierra 3500 SLTSummit White 2020 GMC Sierra 3500 SLTSummit White 2020 GMC Sierra 3500 SLTSummit White 2020 GMC Sierra 3500 SLT

    $53,976

    68,661 mi.
    Est. $1,015/mo

    Fort Collins Dodge, Chrysler, Jeep, RAM

    4.9
    Check Availability
    Fort Collins, CO (910 mi)
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  • Summit White 2020 GMC Sierra 3500 SLTSummit White 2020 GMC Sierra 3500 SLTSummit White 2020 GMC Sierra 3500 SLTSummit White 2020 GMC Sierra 3500 SLTSummit White 2020 GMC Sierra 3500 SLTSummit White 2020 GMC Sierra 3500 SLT

    $44,887

    $844
    136,964 mi.
    Est. $844/mo

    Gee Northwest Autos

    5.0
    Check Availability
    Spokane Valley, WA (1,493 mi)
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  • Cardinal Red 2020 GMC Sierra 3500 SLTCardinal Red 2020 GMC Sierra 3500 SLTCardinal Red 2020 GMC Sierra 3500 SLTCardinal Red 2020 GMC Sierra 3500 SLTCardinal Red 2020 GMC Sierra 3500 SLTCardinal Red 2020 GMC Sierra 3500 SLT

    $51,152

    $718
    68,268 mi.
    Est. $961/mo

    INFINITI of Central Arkansas

    5.0
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    Benton, AR (575 mi)
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  • Brownstone Metallic 2020 GMC Sierra 3500 SLTBrownstone Metallic 2020 GMC Sierra 3500 SLTBrownstone Metallic 2020 GMC Sierra 3500 SLTBrownstone Metallic 2020 GMC Sierra 3500 SLTBrownstone Metallic 2020 GMC Sierra 3500 SLTBrownstone Metallic 2020 GMC Sierra 3500 SLT

    $51,398

    $200
    86,822 mi.
    Est. $966/mo

    Dave Smith Coeur d'Alene

    3.6
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    Coeur d'Alene, ID (1,475 mi)
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  • Brownstone Metallic 2020 GMC Sierra 3500 SLT

    $54,697

    $2.1K
    69,265 mi.
    Est. $1,028/mo

    Al Piemonte Buick GMC

    4.5
    Check Availability
    Elmhurst, IL (17 mi)
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GMC Sierra 3500 prices by year

Model year Average price Deals
2026 GMC Sierra 3500 SLT 2 Good deals
2025 GMC Sierra 3500 SLT $69,949 7 Great deals
2024 GMC Sierra 3500 SLT $63,741 28 Good deals

About the 2020 GMC Sierra 3500 SLT

Basics

SLT shown.

Seating
5
Door count
4
Drivetrain
Rear Wheel Drive
Combined MPG
0
Transmission
6-Speed A/T
Engine
445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)
Side view of the 2020 GMC Sierra 3500 SLT
FAQs

How much does the 2020 GMC Sierra 3500 SLT cost?

The 2020 GMC Sierra 3500 SLT price depends on several factors, including optional features, mileage, vehicle history and location. The nationwide average price for a 2020 Sierra 3500 SLT is $51,222, with pricing starting at $44,887.

What are some similar vehicles and competitors of the 2020 GMC Sierra 3500 SLT?

The 2020 GMC Sierra 3500 SLT compares to and/or competes against the following vehicles:


Is the 2020 GMC Sierra 3500 SLT reliable?

The 2020 GMC Sierra 3500 has an average reliability rating of 4.9 out of 5 according to Cars.com consumers. Find real-world reliability insights within consumer reviews from 2020 Sierra 3500 owners.

Ratings (9 reviews)

100% of drivers recommend this car

Rating breakdown (out of 5):
Comfort
4.9
Interior
4.9
Performance
4.9
Value
4.7
Exterior
5.0
Reliability
4.9
Trims

SLT (4 styles)

Style
2WD Crew Cab 172" SLT 4WD Crew Cab 172" SLT 4WD Crew Cab 159" SLT 2WD Crew Cab 159" SLT
Inventory price
Starting at $54,200 Starting at $57,000 Starting at $56,800 Starting at $54,000
Combined MPG
0 0 0 0
Engine
445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel) 445.0-hp, 6.6-liter, 8 Cylinder Engine (Diesel Fuel)
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GMC Sierra 3500 trims